 /*******************************************************************************
  * Copyright (c) 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.filesystem;

 import java.io.File ;
 import org.eclipse.core.runtime.*;
 import org.eclipse.osgi.service.datalocation.Location;
 import org.osgi.framework.*;

 /**
  * This class abstracts away implementation details of the filesystem
  * bundle that depend on the OSGi framework being started. All
  * file system bundle functionality is enabled regardless of whether
  * OSGi is running.
  * @since org.eclipse.core.filesystem 1.1
  */
 public class Activator implements BundleActivator {
     private static Activator instance;
     private BundleContext context;

     /**
      * Returns the local file system location that should be used for
      * caching file data.
      */
     public static IPath getCacheLocation() {
         //try to put the cache in the instance location if possible (3.2 behaviour)
 try {
             if (instance != null) {
                 BundleContext ctx = instance.context;
                 if (ctx != null) {
                     ServiceReference[] refs = ctx.getServiceReferences(Location.class.getName(), Location.INSTANCE_FILTER);
                     if (refs != null && refs.length == 1) {
                         Location location = (Location) ctx.getService(refs[0]);
                         if (location != null) {
                             IPath instancePath = new Path(new File (location.getURL().getFile()).toString());
                             ctx.ungetService(refs[0]);
                             return instancePath.append(".metadata/.plugins").append(Policy.PI_FILE_SYSTEM); //$NON-NLS-1$
 }
                     }
                 }
             }
         } catch (InvalidSyntaxException e) {
             Policy.log(IStatus.INFO, null, e);
             //fall through below and use user home
 }
         //just put the cache in the user home directory
 return Path.fromOSString(System.getProperty("user.home")); //$NON-NLS-1$
 // Platform.getStateLocation(Platform.getBundle(Policy.PI_FILE_SYSTEM));
 }

     public Activator() {
         instance = this;
     }

     public void start(BundleContext aContext) throws Exception {
         this.context = aContext;
     }

     public void stop(BundleContext aContext) throws Exception {
         //nothing to do
 }

 }

